Exist

eXist is a native XML database featuring efficient, index-based XQuery processing, extensions for keyword search, XUpdate support, and tight integration with existing XML development tools.

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Developer: exist-db.org
License: GNU Lesser General Public License (LGPL)
Operating System: OS Independent

Evince is a document viewer for multiple document formats.

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Developer: Evince
License: GNU General Public License (GPL)
Operating System: OS Independent (Written in an interpreted language)

Make PHP generated web content available only to your users.

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Developer: Francisco Charrua
License: Freeware
Operating System: Linux, Unix, Windows

PHP Classifieds is one of the most customizable Classified ad program that exist for PHP and MySql.

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Developer: DeltaScripts.com
License: Freeware
Operating System: any

Just a quick and simple web site demo.

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Developer: spaceman
License: Freeware
Operating System: All

Multiple custom templates included, with dozens more on the way.

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Developer: Darren Gates, Cyberkings
License: Freeware
Operating System: Linux, Unix, Windows

db_upload_file() stores a file in a database table.

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Developer: Francisco Charrua
License: Freeware
Operating System: PHP 4.3.3 with MySQL

CrawlTrack is a free application (license GNU GPL), which makes it possible to follow the search-engines crawlers and spiders visits on your website.

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Developer: Jean-Denis Brun
License: Freeware
Operating System: linux, windows